Horizon Stripes

I am trying to figure out the most effective way to utilize gouache in the underpainting. I am enamored of the color differential it provides & want to find an expressive way to use it. The crying oyster shells work some, but I want the the to use the contrast as an integrated part of the design & not the actual design. All of the brighter blue that is present in this image is a direct result of the white gouache underpainted lines, as the only watercolor pigment used was Payne's Grey. So we will see what I can come up with. Happy Tuesday Y'all!